filling the nextion 5 inch screen


greetings to ubitx fans and radio friends.   as a ham who has no programming skills, who cannot compile or make a GUI, how do i get the ubitx_50.tft file to fill the screen when loaded onto the device?  i get a tiny graphic that is the same size as i get on my 2.4 inch nextion display.  it is fully functional but small !  would appreciate some feedback even if only to say that i cant fix it.  many thanks to a great group. Rick WA2TDL

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